Never Tell Satan To Get Behind YouSatan does not belong behind you, even before Jesus defeated him at the cross as he said He would in Genesis:

Genesis 3:14-15And the LORD God said unto the serpent, Because thou hast done this, thou [art] cursed above all cattle, and above every beast of the field; upon thy belly shalt thou go, and dust shalt thou eat all the days of thy life: And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.(KJV)

He put satan under your feet:

Luke 10:19Behold, I give unto you power to tread on serpents and scorpions, and over all the power of the enemy: and nothing shall by any means hurt you.(KJV)

Satan is subject to you, you rule over satan because of the redemptive works of Jesus:

Revelation 1:5-6And from Jesus Christ, [who is] the faithful witness, [and] the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood, And hath made us kings and priests unto God and his Father; to him [be] glory and dominion for ever and ever. Amen.(KJV)

So you can make decrees against satan knowing that God has alreay enforced it:

Job 22:28Thou shalt also decree a thing, and it shall be established unto thee: and the light shall shine upon thy ways.(KJV)God confirmed our authority over satan:

Ephesians 2:4-6But God, who is rich in mercy, for his great love wherewith he loved us, Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved;) And hath raised [us] up together, and made [us] sit together in heavenly [places] in Christ Jesus:(KJV)

Ephesians 1:21-23Far above all principality, and power, and might, and dominion, and every name that is named, not only in this world, but also in that which is to come: And hath put all [things] under his feet, and gave him [to be] the head over all [things] to the church, Which is his body, the fulness of him that filleth all in all.(KJV)

So if all things (including satan) are under his feet, and we are His body, the fulness of him that filleth all in all because of our oneness with Jesus:

John17:17-22Sanctify them through thy truth: thy word is truth. As thou hast sent me into the world, even so have I also sent them into the world. And for their sakes I sanctify myself, that they also might be sanctified through the truth. Neither pray I for these alone, but for them also which shall believe on me through their word; That they all may be one; as thou, Father, [art] in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me. And the glory which thou gavest me I have given them; that they may be one, even as we are one:(KJV)

Then satan belongs also under your feet as a member of the body of Christ; His church. Under your feet, not behind you .

Jesus told satan to get behind Him:Luke 4:8And Jesus answered and said unto him, Get thee behind me, Satan: for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve.(KJV)

Because it was not yet the appointed time for Jesus to put satan under His feet. "Get thee behind me" in that verse simply means to go away, that is why satan ignored him and tempted Him again:

Luke 4:9And he brought him to Jerusalem, and set him on a pinnacle of the temple, and said unto him, If thou be the Son of God, cast thyself down from hence:(KJV)

So telling satan to "get thee behind me" is not really excercing your authority over satan. You must command him, as you know to submit to you in the name of Jesus, you must make decrees against him after submitting to the authority of the Lord. Then you can have expectancy to speak to the mountain in the name of Jesus and command it to be made a plain, and it shall be by the authority in the name of Jesus given to you as the Royal Scepter.God bless you more and more, in the miighty name of Jesus.